APA (7th ed.) Citation

Proctor, R. A. Rough Ways Made Smooth: A series of familiar essays on scientific subjects.

Chicago Style (17th ed.) Citation

Proctor, Richard A. Rough Ways Made Smooth: A Series of Familiar Essays on Scientific Subjects.

MLA (9th ed.) Citation

Proctor, Richard A. Rough Ways Made Smooth: A Series of Familiar Essays on Scientific Subjects.

Warning: These citations may not always be 100% accurate.